hi just wondered if any 1 can point me in the right direction. on my 2wd saph every now and again wen idleing the revs will go up 2 about 2000 rpm 4 no reason. cant seem 2 find an air leak, cud it be sum sort ov electrical problem?. any help would be appritiated, thanks alot shaun...

 

sticking valve mate!! if you turn the ignition of then startit up again does it stablise or creep up again??-used to get the same in my escort cossie!! is it coming out of winter hibernation?

 

It is almost definitely the ISCV, idle speed control valve, needs cleaning!!
Whilst you are at it though set your CO to 2-2.5% CO, and set your base idle, WITH ALL THE PIPES ON, it can be done just fiddly.
Best cleaner I found is carb cleaner folowwed by a liberal spray with silicone polish on the end valve which is the bit that sticks.
Some stick even when this is nice and clean mine does every so often, but not worth worrying about if only now and then.
The idle CO is most important to correct idle, as lean ones will cause a up/down sensation of the idle, and are NOT NEEDED for the MOT test either.
If running ok it will fly through the MOT on emissions with the std CO of 2-2.5.
tabetha

 

help needed if possible?

When i was running standard about 5 months ago it'd idle where the revs would go from 900rpm to 1000rpm Then it stopped doing it. Its just returned again.
I took out the icv and cleaned it and its not improved this problem.
It idles up and down from cold and hot,, and theres a very slight jump misfire every now and then below 1000rpm but not in rev range above..
It drives absolutely fine,, boosts fine etc,, but idle is allover the place.
I'VE JUST fitted a msd stage 3 chip its been fine for the week i've fitted it unitl now?

Is it CO2?
Idle base out?
new Idle control valve?
fUEL pRESSURE.

 

oops wrong thread

 

Answered under other thread!!
tabetha